Mesily Company makes 20,000 units per year of a part it uses in the products it manufactures. The unit product cost of this part is computed as follows: Direct materials $25.10 Direct labour 18.20 Variable manufacturing overhead 2.40 Fixed manufacturing overhead 13.40 Unit product cost $59.10 An outside supplier has offered to sell the company all these parts it needs for $56.00 a unit. If the company accepts this offer, the facilities now being used to make the part could be used make more units of a product that is in high demand. The additional contribution margin on this other product would be $50,000 per year. If the part were purchased from the outside supplier, $5.10 of the fixed manufacturing overhead cost being applied to the part would continue. This fixed manufacturing overhead cost would be applied to the company's remaining products. Required: a. How much of the unit product cost of $59.10 is relevant in the decision of whether to make or buy the part? b. What is the net total dollar advantage (disadvantage) of purchasing the part rather than making it